Liner for centrifugal liquid-separators.



J. V. M. RISBERG.

LINER Pon GBNTRIFUGAL LIQUID BEPARATOBS.

APPLICATION FILED IBB. 16. 1906.

Patented Nov. 3, 1908.

2 SHEETS-SHEET 1.

J. V. M. RISBERG.

LINER FOB. UENTRIFUGAL LIQUID SEPARATORS.

APPLIUATION rum] 11:13.16. 1906.

902,91 3. Patented Nov. 3, 190s.

2 SHEETS-SHEET 2.

UNITED STATES GFFICE.

JOHANNES VALDEMAR MRTEN BISBERG, OF SDIGRTELJE, SWEDEN, ASSIGNOR ',i()AKTIEBOLAGET BALTIC-SEPARATOB, 0F STOCKHOLM, SWEDEN.

LINER FOR CENTRIFUGAL LIQUID-SEPARATORS.

Application filed February 16, 1906.

T o all whom it may; concern.'

Be it known that I, JOUANNES VALDEMAR MRTEN RIsBERG, a subject of theKing of Sweden,residing at Sdertelje, in the Kingdom of Sweden, haveinvented new and useful Improvements in Liners for CentrifugalLiquid-Separatore, of which the following is a specification.

Among means used in centrifugal liquid separator drums for increasingthe effect the most general one consists 1n funnel like plates, insertedinto each other and dividing the contents of the drum (as for instancemilk) into layers thin in radial direction in. the well known manner.The skimming operation or the separating of the fatty globules from themilk serum is effected in the said thin milk layers in such manner, thatthe globules, being lighter than the said serum, are forced inwardtoward the center of the drum along the upper surface of the plates,while the heavier serum is forced outward toward the peripher of thedrum owing to the continual supp y of full milk to the drum. Theseparation of the fatty globules is effected more speedily the shorterthe distance is between the plates, and it is possible, by providingsufficiently thin layers, to extract a great part of theV very smallestfatty globules, difficult to separate owingv to the comparatively greatfriction,

, to which they are subjected.

As learned from the practice, however, one may not proceed too far onthis way, as the distance between the plates cannot be below a certainminimum without the effect being decreased, owing to the fact that theblue milk particles will run outward with such a great force, that theycounteract by friction the movement of the fatty globules in theopposite direction. This invention has for its object to reduce thefrictiomsurfaces between the two liquid currents by a specialconstruction of the conical plates, so t at the distance between theplates can be reduced below the said minimum Without the strongerliquid-currents, resulting therefrom, counteracting the movement of thefatty globules toward the center ofthe drum. Forces acting upon thefatty globules will move the same toward the center but not directlyalong the projection of the radius on the upper side of the plate, asone may think, but in a curved line, forming the resultant of twodifferent forces, viz. the centrifugal Specification of Letters Patent.

Patented Nov. 3, 1908.

Serial No. 301,490.

force acting along the radius vector, and the inertia of the fattyglobules, acting in such manner, that the fatty globules, when movinginward toward the center, tend to etai n the movement in the linear orperipheral direction, in which they were moving when in thestarting-point of the inward motion. As the velocit in the peripheraldirection is greater at t e periphery of the drum than at pointssituated nearer to the center of the same, the fatty globules,`movingtoward the center, will have at each point a peripheral velocity, which,owing to their inertia, is greater than the actual peripheral velocityof each point, owing to which fact the globules do not follow the radiusvector from the starting point but deviate from the said radius in therotary direction, the deviation increasing toward the center in such aman- Iier, that the globules are moving in a )ein more or less spiral inshape. In fact, iowever, the fatty globules are not able to perform thesaid movement in an undisturbed manner in liners consisting of conicalplates ofthe construction hitherto used, which fact is substantiall dueto the continual supply of the full mil According 'to this invention theconical plates are so constructed, that the cream currents, owing to thesaid movement of the fatty globules, are directed to certaincomartments, which are not disturbed by the ull milk continually runninginto the liner.

In the accompanying drawings Figure `l is a vertical section of a linerarranged in accordance with this invention (only a few plates areshown). Fig. 2 is a plan view of a plate. Fig. 3 is a vertical sectionof a modified form of the invention. Fig. 4 is a plan view of one of theplates shown in Fig. 3. Fig. 5 is a section on the line A-B of Fig. 3.Fi rs. 6 and 7 are plan views of two other modi cations.

For the purpose stated above the plates are provided with radialinterposed pieces e Figs. 1 and 2, extending from or substantia ly fromthe central opening of the plate to the eriphery, consequently over thewhole skimmin surface. x, Fig. 2, may indieate a fatty g obule, which ison the point of being separated from a milk layer between the lates. Thesaid globule is forced to war force acting upon the milk, but as thesaid globule acted upon by its -inertia. at the same the center owing tothe centrifugal time tends to retain a peripheral velocity, which isreater than that of the neighboring parts of t e plate, as stated above,the globule will move in the direction indicated by the arrow at m,provided that the drum is rotated clockwise. Owing to this fact theglobules will gather at the rear side l) of the ieces or ribs a and movealong the same inward toward the center.

The blue milk particles, on the other hand, are also subjected to theaction of the centrifugal force and the inertia. The centrifugal forceforces the same outward toward the periphery, owing to their greaterspeciiic weight, and owing to'their inertia they tend to retaln theirinitial peripheral velocity. As the said particles are moving frompoints with less peripheral velocity toward points with greatervelocity, they will, contrary to the fatty globules, slide' backward onthe plates and consequently move in a direction opposite to that of thefatty globules i. e. opposite to that indicated by the arrow at Owing tothis fact a current of blue milk will move toward the periphery alongthe iront side d of the ribs a, Consequentl the spaces between theplates are divided y the ribs into compartments, some ones for the creamand other ones for the blue milk. In order to avoid collision betweenthe cream currents and the full milk entering the liner, the latter isled into the spaces between the plates through openings e, provided inthe arts of the neutral zone, which are situated Just in front of theribs a with regard tothe rotary direction. Owing to currents caused bythe ribs the neutral zone, which in liners before known consists of a clindrical layer will have the shape indicate by the dotted lines c.Consequently the full milk is introduced at points of the neutral zonesituated nearest to the center. The distance of the neutral zone fromthe center, however, changes owing to certain variable agents and forthat reason the openings e must be made sufficiently great radially andmay, advantageously, have the same length as the ribs a. In such casethe plates are preferably arranged as shown in Figs. 3 and 4. The platestrips f resulting from the providing of theopenlngs e are folded alongthe edges, cohermg with the plate cone, outward or inward in such amanner, that the bear against the outer or inner side respectively ofthe cone and form the ribs or interposed pieces a, as shown in Fig. 5.

The interposed pieces or ribs a, may be rovided in many other ways asfor instance by projections formed in the plate by ressing, as readilyunderstood by those skil ed in the art. The ribs may have otherdirections than the radial one without their action being substantiallychanged. Thus in Figs. 6 and 7 lates are shown having ribs a, extending1n an oblique or spiral direction.

Havlng now described my invention, what I claim as new and desire tosecure by Letters Patent is:

In liners for centrifugal separators, the combination with conicalplates arranged one within the other, of ribs a extending substantiallyfrom the central openin s of the plates toward their eripheries anlocated substantially above t e ribs of the next subjacent plate throughthe whole set of plates and having a height equal to the distancebetween the plates, so that the spaces between the plates are dividedinto separated cells, and inlet o enings e for the said cells, locatedimmeiately in front of the ribs forming the rea'r partition walls of thecells with re ation to the rotary direction.

. In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

JOHANNES VALDEMAR MRTEN RISBERG.

Witnesses:

CARL FRIBERG, ROBERT APELGREN.

